L tancred



W. L. TANCRED July 3, 1956 ACTUATOR-ACCUMULATOR ENGAGING AND DISENGAGINGMECHANISMS l0 Sheets-Sheet 1 Filed Aug. 18, 1949 awed 419 4 M i W. L.TANCRED July 3, 1956 ACTUATOR-ACCUMULATOR ENGAGING AND DISENGAGINGMECHANISMS l0 Sheets-Sheet 2 Filed Aug. 18, 1949 10 Sheets-Sheet 3 EEEEW. L. TANCRED ACTUATOR-ACCUMULATOR ENGAGING AND DISENGAGING MECHANISMSJuly 3. 1956 Filed Aug. 18, 1949 W. L. TANCRED July 3, 1956ACTUATOR-ACCUMULATOR ENGAGING AND DISENGAGING MECHANISMS l0 Sheets-Sheet4 Filed Aug. 18, 1949 July 3, 1956 w. TANCRED ACTUATOR-ACCUMULATORENGAGING AND DISENGAGING MECHANISMS l0 Sheets-Sheet 5 Filed Aug. 18,1949 b @Q 161/ SQ l kw NI CHANISMS W. L. TANCRED July 3. 1956ACTUATOR-ACCUMULATOR ENGAGING AND DISENGAGING ME Filed Aug. 18, 1949 10Sheets-Sheet 6 EMUIIIIIIZ :h R 7 j 89 L ii g $9 fi @I 1 July 3, 1956 'w.L. TANCRED ACTUATOR-ACCUMULATOR ENGAGING AND DISENGAGING MECHANISMSFiled Aug. 18, 1949 10 Sheets-Sheet 7 r U W w. L. TANCRED 2,753,111

ENGAGING MECHANISMS July 3, 1956 ACTUATOR-ACCUMULATOR ENGAGING AND DISl0 Sheets-Sheet 8 Filed Aug. 18, 1949 RM. I"! I I I I i llr i: :n..|\ QQg m E W G N3 mm filw G W IG| G Li M .3 f m w \k I \Q w JJ Q W. L.TANCRED July 3, 1956 ACTUATOR-ACCUMULATOR ENGAGING AND DISENGAGINGMECHANISMS l0 Sheets-Sheet 9 Filed Aug. 18

W. L. TANCRED July 3, 1956 ACTUATOR-ACCUMULATOR ENGAGING AND DISENGAGINGMECHANISMS l0 Sheets-Sheet 10 Filed Aug. 18, 1949 United States PatentACTUATOR-ACCUMULATOR ENGAGING AND DISENGAGING MECHANISMS William L.Tancred, Hartford, Conn., assignor, by mesne assignments, to John H.Reid, Hartford, Conn., and W. Sidney Felton, Salem, Mass., as trusteesApplication August 18, 1949, Serial No. 110,980

. 7 Claims. (Cl. 235-60) This invention relates to computing machines,and more particularly to machines for performing addition andsubtraction.

One object of the invention is to provide such a machine of small sizeand weight so that it is easily carried about.

A further object is to provide such a machine which may be operated byeither hand.

Still another object is to provide such a machine wherein the totalizingmechanism does not change its elevation in the casing during operationof the machine.

Another object is to provide against lateral bending stresses in thestampings which constitute a major portion of the movable elements ofthe machine.

A further object is to avoid as much as possible the use of load andfire mechanisms which tend to produce sudden and extreme inertia forces.

Still another object is to simplify and reduce the number of parts.

A further object is to provide for sub-assemblies of parts into groupswhich may be separately assembled and then associated together in thecomplete machine which makes for ease and simplicity in effectingrepairs.

A further object is to improve the actuating mechanisms for thetransversely moving selector stop carriage.

Another object is to provide means for preventing accidental back-upmotion of the carriage such as might be due to rough handling oraccidents to the machine.

A further object is to provide for balanced motion at opposite sides ofthe under-carriage while operating the totalizer mechanism.

Another object is to provide a single control mechanism for error andfor repeat.

A further object is to provide means which eliminates sticking of thenumber keys, assists full return of the keys, and provides for uniformstroke of the keys.

Still another object is to provide means for limiting the speed ofmotion of parts so that they will not over-travel or produce inertiashocks and which at the same time produce a small vibration which tendsto prevent sticking of movable parts.

Still another object is to provide means which imparts a feel to theoperator when any of the number keys is depressed, the feel indicatingto the operator when a full stroke of the key has been produced.

Further objects and advantages will appear from a description of anembodiment of the invention shown in the accompanying drawings in whichFigures 1 and 2 are top plan and right side elevational views,respectively, of a machine embodying the invention.

Figure 3 is a vertical sectional view on line 3-3 of Figure 1.

Figures 4 and 5 are detail sectional views on lines 4-4 and 5-5,respectively, of Figure 3.

Figures 6 and 8 are detail sectional views on lines 6-6 and 8-8,respectively, of Figure 5, Figure 8 showing the totalizer parts inadding relation.

Figure 7 is a fragmentary exploded perspective view of certain parts ofthe totalizer actuating mechanism.

Figures 9 and 10 are views somewhat similar to Figure 8, but showingcertain parts of the totalizer actuating mechanism in subtracting andclearing relations, respectively.

Figures 11 and 12 are views similar to Figure 10, but with parts omittedor broken away, the parts shown being in successive positions after thepositions shown in Figure 10 during a clearing operation.

Figure 13 is a longitudinal sectional view on lines 13-13 of Figure 5,the parts being shown in neutral or starting position.

Figure 14 is a fragmentary view similar to a portion of Figure 13 butshowing the actuating parts at the start of an adding operation on atotalizing wheel.

Figure 15 is a detail sectional view on line 15-15 of Figure 5, theactuating parts being shown at the end of an adding action on atotalizer wheel with a carry-over.

Figure 16 is a fragmentary view similar to a portion of Figure 15, butwith the actuating parts in neutral positions.

Figure 17 is a detail sectional view on line 17-17 of Figure 15 showingthree totalizer wheels with certain of their actuating parts, one of thetotalizing wheels being shown in section.

Figure 18 is a detail sectional view on line 18-18 of Figure 17.

Figure 19 is a fragmentary sectional view on line 19-19 of Figure 3.

Figure 20 is a fragmentary sectional view on line 20-20 of Figure 19.

Figure 21 is a detail sectional view on line 21-21 of Figure 3.

Figure 22 is a fragmentary view to a larger scale partly in elevationand partly in section of one of the number keys and its spring.

Figure 23 is a fragmentary sectional view with parts broken away on line23-23 of Figure 3, the selector stop carriage being shown at thestarting of an adding or subtracting operation.

Figure 24 is a view similar to a portion of Figure 23, but showing theselector stop carriage at its final limit of motion as when a series ofactuating number keys equal in number to the totalizing wheels have beendepressed.

Figure 25 is a detail sectional view on line 25-25 of Figure 23.

Figure 26 is a fragmentary view partly in front end elevation and partlybroken away and in section and showing mechanism also appearing inFigure 25.

Figure 27 is a perspective view of the undercarriage and spring bar andone of the totalizer rack pilot bars.

Figure 28 is a fragmentary perspective view of a portion of the selectorstop carriage and related part showing the safety catch for thecarriage.

Figure 29 is a fragmentary perspective view showing the releaseretaining mechanism effective in the clear adjustment.

Figure 30 is a view similar to a portion of Figure 13, but showing amodified carry-over mechanism.

Figure 31 is a view similar to Figure 15, but showing the same mechanismas Figure 30.

Figure 32 is a view similar to Figure 17, but showing the carry-overmechanism of Figures 30 and 31.

Figure 33 is a fragmentary exploded perspective view of certain of theparts in the modified carry-over mechanism of Figures 30 to 32,inclusive.

Number selecting mechanism Projecting through the cover member 1 themachine casing 2 are ten selector keys 3, 4, 5, 6, 7, 8, 9, 10, 11 and12 which correspond to the digits zero to 9 inclusive.

Each of these keys has a shank which extends slidably through the casing1 and through slots in a transverse partition 16. Referring to Figures19 and 20, each of these shanks beneath the cover 1 is provided with alateral arm 17 which extends over one or the other of a pair of hingedequalizer plates 18. These plates 18 are pro vided with cars 19 alongtheir remote edges which extend through slots in flanges 2t) upstandingfrom the transverse partitions 16. These plates 18 are cut awaycentrally as at 21 and at opposite sides of the cut away portion theyoverlap in sliding hinge formation at 22.

The extremities of all of the arms 17 are brought into an alined seriesas at 25, except that extending from the key 12 representing the digit9. The extremity of this arm 17a terminates above one of the plates 18.The mating edges of the plates 13 are normally held elevated against theunder edges of the various arms 17 as by suitable leaf springs 28, thelower ends of which are secured to the top face of the partition 16 asby rivets 29 (see Figure 19).

Each of the keys may be held normally elevated as by a leaf spring 30supported at one end on the partition 16 and at the other end engagingin a notch 31 in the lower portion of the key shank 15. These springs30, as shown in Figure 22, have normally straight intermediate portionswhich buckle when the corresponding key is depressed substantially halfway down, giving a distinctive feel to the operator so that he may besure that each is depressed a full stroke.

The extremities of the arms 17 in the alined series 25 are positionedabove a plurality of series of selector stops 35, there being nine suchstops in each of a plurality of rows, the number of rows being equal tothe number of denominational orders which it is within the capacity ofthe machine to total. As shown there are eight such rows, and theseselector stops are mounted vertically in a carriage mounted for motiontransverse of the machine. As shown best in Figures 3, 5, l3, l4 and 19,this carriage is supported for lateral sliding motion on a rod 41 whichextends across the machine and on the lower forwardly turned extremity42 of a laterally extending frame member 43 depending from the framemember 16. Each of the selector stops 35 is vertically movable in thecarriage between either of two positions in each of which it may beyieldingly retained as by the engagement in one or the other of a pairof notches 45 in its side face of a V extremity of a looped leaf spring46. As shown, for example, in Figure 21, one of these selector stops atthe left hand end of the row has been depressed so that the spring 46engages in the upper notch 45, while the remainder of the selector stopsare shown in raised position with the corresponding leaf spring in thelower notch 45.

Beneath the carriage 4t] and toward the right hand side of the machinethere is positioned a cam plate 47 (Figure 21) having at its left edge adown-turned portion 48 so that when the carriage 40 is moved to itsright hand position, any of the selector stops 35 which may have beendepressed are cammed up to their upper positions and ride upon the topface of the plate 47. As the car riage is moved toward the left, theseveral rows of selector stops are brought sequentially beneath theseries of extremities 25 of the selector keys so that whenever one ofthese selector keys is depressed, the corresponding selector stop in itsseries is also depressed. After each actuation of a number key todepress a selector stop the carriage 40 moves to present the next row ofselector stops beneath the series of actuator extremities. The mechanismby which this is accomplished will now be explained.

Referring to Figures 5 and 23 to 25, it will be noted that the carriage40 has fixed thereto one end of a flexible ribbon 50, the opposite endof which engages more or less about the periphery of a segment 51 whichis fixed to a vertical pinion shaft 52 which has at its lower end apinion 53. With this pinion meshes a rack bar 54 carried by a.

slide plate 55 which is normally pulled rearwardly as by a spring 56secured at one end to the forward downturned extremity 57 of the slideplate 55, and at its other end to the extremity 570 of a lever 5% whichextends across the machine and has a pivotal end portion 581 fulcrumedin an opening 59 in the left hand vertical partition 216. A roller 580carried by the lever 58 and bearing against the inner face of thepartition 217 retains the lever 58 in position. The slide plate 55 has alongitudinal slot 61) through which the shaft 52 passes and a parallelslot 61 through which a pivot pin 62 secured to the lever 58 extends.

The spring 56 tends to turn the segment in a direction to project thecarriage to the left hand end of its linear path into the position shownin Figure 24 at which time the ribbon 53 is substantially wholly unwoundfrom the segment 51. The carriage at its other limit of motion is shownin Figure 23 where approximately one-half of the length of the ribbon 50is wound upon the periphery of the segment 51 against which it is heldas by a roller 65 carried by a fixed frame member 66 and spacedsufficiently from the periphery of the segment 51 to permit the passageof the ribbon 50 between them. As a result of the described arrangement,the energy stored in the ribbon spring 50 is applied with a positivegradient as it is unwound, i. e., its force is increased as the carriage40 is advanced to the left-while the energy stored in the coil ortension spring 56 is applied with a negative gradientits force beingdecreased as the carriage is advanced to the left. The combination ofthe two springs, arranged as described, results in their stored energybeing applied with a flat gradient, i. e., the carriage 40 advances byan equalized force to the left, the force at the beginning of the travelis thus the same as at the end of travel. Along its forward upper edgethe carriage 40 is provided with a forwardly extended flange member 70which is formed on its edge with a plurality of notches 71 betweenforwardly extending teeth 72, and means are provided cooperating withthese teeth and notches for permitting the carriage to be moved by theaction of the spring 56 from the position shown in Figure 23 toward thatshown in Figure 24 by a series of steps, each suflicient to remove onerow of selector stops out from beneath the extremities 25 of theselector keys and to bring the next row of selector stops into the sameposition, and this action takes place each time a number key isdepressed between actions of the totalizer mechanism. The mechanism foraccomplishing this is shown best in Figures 19 and 20.

Referring to these figures, pivoted to a lug 75 on the left handpartition 216 is one end of a dog 77 having a downwardly extended hookportion 78 at its opposite end. This dog 77 intermediate to its ends isturned to the rear, or upwardly as shown in Figure 20, and overlies asecond dog 79 which is pivoted to the dog 77 at 80. This dog 79 has atits inner end an upturned hook member 81. When the equalizer plate 18 isdepressed by depression of any of the number keys, the plate contactsand depresses the dog 77. The dog 77 and the dog 79, are thus bothdepressed, the hook portion 81 is depressed from one of the notches 71,while the hook portion 78 comes down in front of one of the teeth 72.Thus the carriage is released for a one-half step motion toward the leftas the hook 81 is depressed and the carriage steps over until one of theteeth 72 contacts with the hook 78. On subsequent lifting of theequalizer plate 18, the dog 77 is lifted by the action of a leaf spring85 which bears on its under face and is threaded through a pair of holes86 and 87 in the partition 216. The hook 81 then comes into the nextnotch 71 permitting a second one-half step of the carriage and furtherlifting of the dog 79 lifts the fulcrum 8%) until a roll 88 thereon isstopped by engagement with a positive stop member 89. The hook 78 isthen out of contact with the carriage and so remains until it isdepressed by a subsequent depression of any one of the number keys. Withthis arrangement, each time the operator depresses a number key thecarriage moves over by one step, the number of steps corresponding tothe number of digits in the numb-er which is to be added or subtracted,at each actuation of a number key there being a correspondinglypositioned selector stop in the corresponding row of selector stopsdepressed. For example, as shown in Figures 13 and 14, the No. 4 stop isdepressed in the particular row in position where the carriage was whenthe number key was depressed. At each actuation of the totalizingmechanism the carriage is moved back to its extreme right hand orstarting position by means which will later appear.

Means are also provided by which the carriage is prevented from beingmoved to its initial position accidentally as by the machine beingdropped on its edge or otherwise receiving rough handling. This meanscomprises a third dog 95, shown best in Figures 19 and 28, this doghaving a downwardly projecting point 96 adapted to project into one ofthe notches 71 at the right hand face of a tooth 72. This dog 95, asbest shown in Figure 28, comprises an angle member, one arm 97 of whichis provided with an upstanding lug 98 fulcrumed on a shaft 99 mounted atits ends in a bearing lug 100, and in a flange 101 upstanding from thecross frame member 16. Also rockable on the shaft 99 is a U-shapedportion 102 of an arm 103 which has an upstanding and forwardly turnedend portion 104 against which one of the side arms 105 of the machineoperating bar engages when this bar is in its neutral position. A spring106 has one end engaging the upper edge of the dog 95, its intermediateportion is wound around the shaft 99, and its opposite end portion isfixed to the side of a lug 107 upstanding from one arm of the U-shapedmember 102. The spring 106, when the arm 103 is in the position shown inFigure 28, is tensiOned to hold the dog 95 in its downward lockingposition back of one of the teeth 72. It may be seen in Figure 28 thatan extension (shown in dotted lines) of the member 102 extends beneathand engages the under surface of the arm 97 which is integral with thedog 95. A spring 108 is fixed at one end to the pin 109, supported onthe plate 16, and at its other end is secured to the U-shaped portion102 at 110. As the member 102 is rocked by the spring 108 upon movementof the handle bar 105 away from the member 103, the downward pressure ofthe spring 106 on the dog 95 is released and at the same time theextension of the member 102 acts on the bottom surface of the arm 97 andlifts the dog 95 out of position to obstruct the return motion of thecarriage.

Totalizer As shown, the totalizer comprises a series of digit wheels 120journaled on a shaft 121 which extends across the machine. Each of thesewheels 120, carries two complete sets of digits from 0 to 9 on itsperiphery, one digit at a time of the several wheels being visiblethrough a window 125 in the top of the casing. As shown, each of thewheels comprises a pair of disks 126 and 127 secured to the hub portions128 and 129 of a pinion 130. These disks 126 and 127 are provided withannular stiffening ribs 131 and disk 126 has a rim portion 132 whichcarries the digit indications. At diametrically opposite points, thedisk 127 has outwardly projecting ears 135 and one or the other of theseears is in position to act on other mechanism when the disk is beingturned between positions where a O and a 9 thereon are moving beneaththe window. These disks are in number equal to the number ofdenominational orders which it is Within the capacity of the machine toregister, nine such orders being shown, although more or less might beemployed as desired.

Except when a wheel is to be turned, it is held locked against turning,and locking means for each wheel consists of a finger 140 carried by aU-shaped member 141 which extends across the series of totalizer wheels,the end walls of which are slotted to slidably engage guides 142 coaxialwith the totalizer shaft 121. The fingers 6 are provided with teeth 143adapted to engage between the teeth of the corresponding pinion 130. TheU-shaped member 141 is supported by a hanger 144 carried by a shaft 145.By rocking this shaft from the position shown in Figure 13 to that shownin Figure 14, the fingers 140 may be retracted from their respectivepinions, thus unlocking the totalizer wheels for turning motion.

Totalizer actuating mechanism The totalizer mechanism is actuated by therocking of a handie bar which extends across the machine toward itsfront end and is carried at opposite ends by a pair of arms 105. Thesearms extend through slots in the top wall of the casing, and towardtheir lower ends these arms 105 are fulcrumed on a transverselyextending shaft 156. Beneath the top frame member the arms 105 arecross-connected by a transverse member 157 which may be integral withthese arms. The lower ends of the arms 105 beneath the fulcrum shaft 156are pivoted as at 158 to the rear ends of a pair of links 159 to whichare attached the rear extremities of a pair of rods 160 which extendslidably through end flanges 161 and 162 of U-shaped links 163withdrawal from which is prevented by suitable means such as lock nuts.A spring 164 surrounds each of the rods 160 and bears at its forward endagainst an in-turned end flange 165 of the link 159 and at its other endagainst the flange 161. This provides a yielding connection between thelower ends of the arms 105 and the members 163. The members 163, inturn, are connected by pivot and slot connections at 167 to theintermediate portions of a pair of arms 170, pivoted at their upper endson trunnions 1'71 and pivotally connected at their lower ends as at 172to a pair of links 173, the forward ends of which are, in turn, pivotedat 174 to side members 175 (see articularly Figure 27) of anunder-carriage. These side members 175 are supported at their rear endson a transverse rod 176 which passes through slots 177 therethrough.These side members 175 are connected together as by a transverse plate178 which may be integral therewith and which has a forward centralextension 179 which may be provided along one edge with a rack portion180. This rack portion 18E), as shown best in Figures 23 and 24, maymesh with a pinion 181 on a shaft 182 which also carries a wheel 183having a serrated periphery and is held in such mesh by an idler 1836with which the opposite edge of the extension 179 engages. This wheel183 is a portion of a damping mechanism, which may be employed, ifdesired, to limit the speed of actuation of the parts and thus avoidundesirable inertia forces. Cooperating with the serrations on theperiphery of the Wheel 183 are a pair of pins 184, 1813 carried by anoscillator bar 185 fulcrumed at 186. This oscillator bar may be of someweight. Turning of the wheel 183 causes its serrations to engage withthe pins 18%, 188, imparting a rapid oscillation to the bar 185' whichproduces the desired speed limiting action due to inertia of the bar185. It also imparts a vibration which acts on the various portions ofthe machine to avoid sticking of the parts under friction of rest,resulting in a sensitivity of action which causes prompt response of thevarious mechanisms to actuating pressure. The wheel 183 and the bar 185are preferably of material such as hard fibre or resin composition toavoid noisy operation. The forward end of the member 179 is narrowed,and provided in its narrow portion with a pair of upstanding flanges and191. Adjacent to its widened rear portion it has upstanding therefrom aroller journaled on a post 196. The lever 58 hereinbefore mentioned inconnection with the carriage mechanism bears against the forward edge ofthe cam roll 195 as shown best in Figure 23 for a purpose which willlater appear.

The side members 175 of the under-carriage are provided with a pair ofopposed longitudinal slots 200 within which is slidably mounted the endportions of a spring bar 201 and arranged along this spring bar andperpendicular thereto are a series of totalizer pilot bars 202, therebeing one of these pilot bars for each totalizing wheel, Figure 27showing but one of these bars in position. They are all alike, however,so that a description of the mounting of the one shown in Figure 27 willsuflice for all. Each is provided with a longitudinal slot 203 throughwhich the spring bar 201 passes, this slot 203 being of increased widthtoward its rear end, as at 294, where it is slidably guided on the crossrod 17s shown in Figures 8 to 16, inclusive. The under side of itsforward portion is cut away as at 265 and houses therein a coil spring2%, the forward end of which is engaged with the bar 222 through a hole287 therethrough, and the rear end of which is engaged in a hole 203through the spring bar 201. Each of the bars 232 is therefore connectedto the spring bar yieldingly and the spring bar is connected through alost motion of the slots 2% with the under-carriage. The forward end ofeach bar 292 is provided with a longitudinal slot 214) within whichrides the pivot shaft 156, opposite ends of each bar 202 thus beingsupported for lon itudinal sliding motion on the pivot shaft 156 and thetransverse bar 176.

With this construction'it will be noted that when the handle bar 15% isswung forwardly and downwardly, as permitted by arcuate slots 215 in apair of inner longitudinal partition members 216 and 217, through whichthe connecting member 157 of the arms 195 passes, the bars 159 are movedrearwardly and through the springs 164 and the members 163, the levers17% and the links 173, the under-carriage is given a rearward motion.The speed of carriage motion is regulated bythe speed of rotation of thenotched wheel 183, which, however, does not interfere with the rate ofmotion of the handle bar 159, any difference in speed being taken up incompression of the springs 16 2-.

Through the springs 29%, a pressure tending to move each of the bars 2G2rearwardly is also produced, but some of these bars, depending upon thelateral position of the selector stop carriage, may not be able topartake of such motion. This is for the reason that they may be heldback by hooks 220 (Figures 3, 13 and 14), one for each of the bars 202being fulcrumed on a shaft 221 held in supporting lugs 222 and 223 onthe inner faces of the partitions 216 and 217, as shown best in Figure4. The rear ends of the hooks 220 may be held in inoperative positionsby a forwardly directed flange 224 on the lower forward edge of theselector stop carriage as is shown in Figure 14. This flange 224 holdsthose hooks inoperative which are associated with the pilot bars of thedenominational orders which were employed in setting up a particularnumber in the machine. All the other hooks, at the time of actuation ofthe handle bar 150, will be depressed at the time of such actuation,bringing a shoulder 225 on each beyond a stop flange 225 on thecorresponding pilot bar 2&2, thus preventing the backward motion of thecorresponding bar 262 when the handle 150 is pulled downwardly andforwardly.

Those bars 262 which are not so locked will be pulled rearwardly by therearward motion of the under-carriage until a second stop element 227thereon engages against that particular selector stop of the selectorstop carriage which was depressed by the depression of the correspondingnumber key. For example, as shown in Figures 13 and 14, the selectorstop corresponding to the four-digit key is depressed, so that thecorresponding stop lug 227 of the corresponding pilot bar 2492 will movercarwardly into contact and be stopped thereby. It will be noted that onthe rear edge of the selector stop carriage there is a downwardlydepending flange 230 which provides a stop corresponding to thedepression of the 9-digit key. This is the extreme limit of motion ofany of the bars 202 so that it is not necessary to provide a movableselector stop for this digit key. Consequently this digit key,-

as shown best in Figure 20, extended only into contact with one of theequalizer plates 18 as at 17a.

Means are provided by which the hooks 22% are lifted above the flange224 when the handle bar is in its rearward normal rest position, so thatthey will not interfere with the lateral motion of the selector stopcarriage. This lifting is done by the following means. 011 the insideface of each of the partitions 216 and 217 are pivoted a pair of dogs235, as on the pivots 236. Each of these dogs has a. shoulder 237 whichis contacted by the crossbar 157 of the handle mechanism when thishandle mechanism is in its rearward upright position, shown for example,in Figure 13. Bridging across from one to the other of these dogs 235'is a somewhat channel-shaped member 238 which has a curved marginalflange which rides upon a cam surface 240 on a tail portion 241 of eachof the hooks 229. This cam surface 240 is held into contact with theportion 239 as by a spring 243 for each of the hooks 220, this springbeing connected at one end to the hook as at 244 and at its other end tothe opposite edge flange 242 of the member 238. The cam surface 24% isso shaped that when the handle bar 159 is in its normal position and theportion 239 engages the upper portion of the cam face 24%, the tailportions 2 :1 are pressed forwardly and downwardly, lifting the rearwardends of the hooks into the position shown in Figures 3 and 13. When thehandle bar member is moved downwardly, the dogs 235 tilt as shown inFigure 14, allowing those hooks which are not positioned above thecarriage flange 224 to drop down until their shoulders 225 engagerearwardly of the lugs 226 of the corresponding actuator bars 202. Onlythose pilot bars 262 which are free of the hooks 22d riding on thecarriage flange 235 are then permitted a backward movement in responseto the downward swing of the handle 15%, and those pilot bars 262 whichare permitted such a motion are permitted this motion only to the extentdetermined by the particular selector stop which was depressed by theaction of a number key, or in case the No. 9 key was depressed by thecarriage flange 23-9. The motion of the pilot bars may thus be caused toactuate the corresponding totalizing wheels selectively to rotate thesewheels in adding or subtracting direction, or to bring all the wheels to0 position to clear the machine for the commencement of the addingoperation.

Each of the bars' 2&2 is arranged to actuate, under suitable controlledconditions, a totalizer bar 250 which is mounted directly beside itspilot bar 292. It is mounted for sliding motion on the shaft 221 whichpasses through a guide slot 251 through the forward end portion of thebar 259 and its rear end, has a similar slot 252 through which extends asecond guide bar 253. This guide bar 253, however, is movable up anddown within vertical guide slots 2531 in the wall members 2&6 and 217,so as to present either an upper downwardly facing rack bar portion 255,or a lower upwardly facing rack bar portion 256 at its rear end intoengagement with the corresponding pinion 13! of a totalizer wheel, or tobe in an intermediate position where both of these rack bars are out ofengagement with the pinion. The upper rack bar is shown in engagementwith the pinion in Figure 9 and the lower rack bar is shown in suchengagement in Figures 8, 14 and 15, while the rack bar is shown in theintermediate position with neither rack bar in engagement with thepinion in Figures 13 and 16. it will thus be noted that the rack barsare spaced a distance slightly greater than the maximum diameter of thepinion.

in order to adjust the guide bar 253 between its three positions ofelevation, its opposite ends are carried by a pair of cams 260, one ofwhich is shown best in Figure 7. Each cam 26% is supported between apair of fixed abutment pins 2261, 2'62 diametrically oppositely disposedto the guide bar 253 and supported by the frame members 216 and 217.Each of the cams 260 has an external cam face including a high arcuateportion 265 and a low arcuate portion 266 which are arrangeddiametrically opposite to each other. Between these high and low arcuateportions are portions 267 of intermediate height. The pins 261, 262 arein line with the slots 2531 and are so spaced apart that when oneengages the high arcuate portion of the cam, the other engages the lowarcuate portion and the guide bar 253 is held in either its upper orlower extreme positions.

Means are provided by which the cams 260 are rocked angularly about theaxis of the guide bar 253, this rocking motion causing the guide bar 253to be moved vertically in its guide slots so as to take either itsextreme upper position, its extreme lower position, or an intermediateposition. In the upper position the lower rack bars are moved up intoengagement with their mating pinions. In the intermediate position bothrack bars are out of engagement with their pinions, and in the lowerposition the upper rack bars are in engagement with the pinions.

The means by which the cams are rocked to take these various positionscomprise a trace 270, shown detached in Figure 7 and positioned to theright of the partition 217. Its rearward end portion is pivoted as on apivot pin 310 which passes through a hole 272 in the trace, and it alsohas a longitudinal slot 273 therein through which passes a pin 274projecting from the lower end of an L-shaped member 275 which isfulcrumed at its perforation 276 on the pivot pin 2710 which issupported on the partition or frame member 217 (see Figure The pivot pin310 is supported on a hanger 301 which is described further hereinafter.At the upper end of the L-shaped member there is attached one end of acoil spring 277, the opposite end of which is attached to a fixed pivotpost 278. This spring tends to hold the upper portion of the L-shapedmember 275 rocked against a stop lug 279 projecting from the forwardedge of a lever 280, the lower end of which is also pivoted on the pivot2710 on frame 217. This lever 280 projects upwardly through a slot 289in the top of the casing and has an actuating knob 290 at its upper end.The slot 289 is normally covered by a sliding plate 291 which moves withthe lever 280. The lever 280 has three positions, its forward positionshown in Figure in which the stop lug 279 is out of contact with theforward edge of the L-shaped member 275, an intermediate position shownin Figures 3 and 7 where the L-shaped member 275 is in contact with thestop lug 279, and a third rearward position where the stop lug 279 isstill in contact with the member 275 but in which the member 275 isrocked rearwardly with its pin 274 in its upper position, rocking thetrace upwardly into the position shown in Figure 9. The L-shaped member275 has but two angular positions, in one of which the forward end ofthe trace 270 is lifted as shown in Figure 9; the other in which theforward end of the trace is lowered as shown in Figures 3, 8, and 10.

Addition When the knob 290 is in its intermediate position, the partsare positioned to cause operation of the machine to add, and in thisposition of the parts, the L-shaped member 275 is so disposed as tolower the forward end of the trace. The operator presses the number keyscorresponding to the number of digits in the number which is to beadded, starting from the left hand digit, and when this has beencompleted, he rocks the handle bar 150 downwardly and then allows it toreturn to its former upright position. The rocking of the handle bar 150downwardly through the means previously described causes theunder-carriage to move rearwardly. After a small lost motion of theunder-carriage until it contacts the spring bar 201, the spring barmoves rearwardly with the carriage, and through the springs 206 movesall of the pilot bars which have been held unlocked by the se lectorstop carriage flange 224 holding the locking hooks elevated, as far aspermitted by the particular selector stops which have been depressed inaccordance with the particular number keys which have been depressed.This backward motion of each of the pilot bars 202 which have beenreleased, acts through a pin 295 on the corresponding totalizer bar 250which contacts a shoulder 2990 thereon (Figure 14) to move the totalizerbar rearwardly. At this time the guide bar 253 is in its intermediateposition so that the totalizer bars move rearwardly out of contact withthe pinions of the totalizer wheels. It will be noted that theunder-carriage moves through its complete length of stroke at each fullactuation of the handle bar 150, but the length of stroke of each of thepilot bars 202 and its totalizer bar 250 is dependent upon theparticular selective stop which is contacted by the lug on the bar 202,thus limiting the lengths of stroke of the rack bars to distancescorresponding to the particular number of the number key which controlsit. The backward motion of the under-carriage continues until theforward end of the slot 177 engages the cross bar 176, whereupon thiscross bar 176 is carried with it for the remainder of its stroke. Thiscross bar 176 at its right hand end engages in a perforation 300 in ahanger 301, shown detached in Figure 7, and which is provided withspaced slots 302 and 303 adjacent to its ends through which pass fixedpins 304 and 305 projecting outwardly from the side wall 217 so thatthis hanger is permitted a limited horizontal motion. It carries aninwardly projecting pivot pin 310 which engages in the pivot opening 272of the trace 270 so that this trace is given a rearward motion duringthe last portion of the rearward motion of the under-carriage. Theforward end of the trace is provided with a pair of oppositely disposedarcuate slots 311 and 312 within which are adapted to ride spaced pins313 and 314, respectively, projecting outwardly from the right hand cam260.

When the trace is in its lowered position, as in the adding positionassumed, the pin 314 is in the slot 312 and as the trace is pulledrearwardly the cam 260 is rocked from the position shown in Figure 3 tothe position shown in Figure 8. This rocks the cams 260counterclockwise, causing the cams, which ride between the fixedelements 261 and 262, and the bar 253 to be lifted. This lifts the rearends of the totalizer bars, bringing the lower rack bars of each intomesh with the totalizer gears in the position shown in Figure 8. It willbe noted, however, that all the rack bars which have been moved are thenin backward positions which have been determined by the particularnumber keys previously depressed for controlling their associatedtotalizer bars, so that the distances forwardly from the rear ends ofthe rack bars where they engage their pinions is dependent upon theparticular number key which controls each. The rearward motion of thehanger 301, through a pivoted link connection 320 (Figure 3) with thetotalizer locking shaft 145, causes the rocking of this shaft in adirection to withdraw all of the locking fingers from locking engagementwith the totalizer wheels, thus freeing them for rotation. Re1easing ofthe handle bar allows a pair of springs 325 attached at their rear endsto the forwards ends of the under-carriage side bars 175, as through theperforations 326 and attached at their forward ends to fixed points 327of the machine frame, to retract the under-carriage and restore links159 forwardly and handle bar 150 rearwardly to their normal positions.The spring bar 201 being pulled back by the under-carriage, engages theforward ends of the slots 203 in each of the pilot bars which have beenmoved rearwardly to any extent and retracts them all to startingposition. Through the springs 296 which engage the pins 329 on the pilotbars and pins 295 on the totalizer bars, the rack bars which were movedrearwardly when the handle 150 was depressed are pulled back to theirstarting positions, turning the corresponding l 1 totalizer pinions, andtotalizer wheels,'by amounts corresponding to the controlling numberkeys which were initially depressed. The return motion of theundercarriage also causes a similar return motion of the hanger 301,together with the corresponding motion of the trace, which acts upon thelower pin Sldto rock the cams clockwise to their starting position andlower the cross bar 253 to starting position. The return of the hangersalso returns the locking fingers 140 to locking positions, retaining thetotalizer wheels in the positions to which they have been moved by theaction of the rack bars. This return motion of the handle lfitl alsoacts tov return the stop selector carriage to its right hand limit ofmotion and to return the selector stops previously depressed to initialposition. The return of the carriage will be described later.

Totalizer carry-over It will be evident that whenever a totalizer wheelis turned to pass from the 9 indication opposite the sight window to a0, it is necessary to turn the next adjacent totalizer wheel to the leftby one numeral. Means for effecting this will now be described.

As previously noted, each of the totalizer wheels has a pair ofoutwardly projected diametrically opposed ears 135. As the numberindication visible on a wheel is passing between the 9 and 0, one ofthese ears 155 engages and passes across a follower projection 330 on atrigger arm 331 pivoted on a cross shaft 332 (see Figures 13 to 16,inclusive). Each arm 331 has an upwardly extending notch 333 thereinwhich engages over a pin 334 on a hook lever 335' fulcrumed on the bar253. The hooked extremity 336 of this hook is adapted to engageforwardly of a lug 337 projecting from the side face of the nexttotalizer bar to the left of the totalizer wheel whose car 135 contactsthe cam follower lug 330, such engagement normally defining the forwardlimit of motion for each totalizer bar, there being one such hook foreach totalizer bar. The engagement of the ear 135 on this cam followerprojection swings thecorresponding arm 331 from the full line positionshown in Figures 13 and 14 to the position shown in Figures 15 and 16which releases the hook 336 from thelug 337 and permits the spring 295to pull the totalizer bar forwardly until its pin 295 strikes theshoulder 12% of its pilot bar which is just sufficient to turn thecorresponding totalizer wheel by one digit indication. The lower endportion of each arm 331 is provided with a latch pin 34% which rides onthe upper face of a leaf spring 341 having a central hump 342. Thisspring acts as a latch to yieldingly retain the arm 331 in either of theangular positions into which it may be put, both being shown in fullanddotted line in Figure 16. The lower end of each arm 331 also projectsdownwardly as at 342a into the path of motion of a finger 343 carried bythe spring bar 201.

On the next downward motion of the handle bar 150 the rearward motion ofthe pilot bar immediately starts the rearward motion of the releasedtotalizer bar without the starting lost motion present when the forwardmotion of the totalizer bar was stopped in normal position by its hook336. The arm 330 is also returned to its former position lifting thehook 336 into operative position when the finger 343 of the spring barengagesand moves the lower end of the arm 330 rearwardly.

fertilizer carr over modification A totaizer carry-over mechanism ofmodified construction is il ustrated in Figures to 33, inclusive. Inthis modification the trigg r arm n is substituted for the trigger arm@311 shown in Figures l3 to 16, inclusive. The trigger arm is fulcrumedon the shaft 332 and is provided with an edge which normally engagesagainst a laterally extending lug on a pawl pivoted at 454 to a carrier450. This carrier 450 is supported on the vertically movable bar 253 andhas a slot 455 in its upper edge slidabiy guided on the shaft .332. The

normal position of the parts is shown in Figure 30. The pawl 453 isnormally held by a spring 456 attached at opposite ends in a hole 457 inthe carrier 450 and a hole 458 in the pawl in angular position to causethe edge 4-51 of the trigger lever to engage the lug 452 of the pawl andhold the pawl with its latch edge 460 in position for the edge 4-61 ofthe next totalizer bar 259a to the left of the controlling lever 331a toimpinge thereon when the totalizer bars are returned forwardly. Thetotalizer bar 5% is not provided with any lug 337 since this not neededwith the construction herein shown. Whenever the lug 33th of the triggerlever 331a is struck by an car of its totalizer wheel, throwing thetrigger lever 3310 to its forward position as shown in Figure 31, theportion 451 of the trigger lever rocks upwardly and tilts the pawl 4'55counterclockwise, removing its edge drill from obstructing position forthe edge 461 of the totalizer bar next to the left, thus permitting thisbar to retract by one further totalizing wheel indication, and effectingthe desired carry-over, Backward motion of the under carriage in thenext operation of the machine returns these parts to normal positions,as described connection with Figures 13 to l6, inclusive. This modifiedmechanism has the advantage over the mechanism shown in Figures 13 to16, inclusive, in that it is positioned where it is more accessible forinspection and repair when the cover of he machine is removed.

S Mb traction When it is desired to subtract it is first necessary toposition the totalizer wheels in accordance with the original number orminuend, and to this end the keys are operated starting from the lefthand digit of this number. The handle is then depressed and allowed tolift again, thus wing the desired minuend beneath the window. The knob29% is then moved to its rearrnost position shown Figure 9, and thesubtrahez number is then introduced by pressing the corresponding numberkeys, also starting from the left hand digit. The handle bar 15% is thendepressed and allowed to rise as before.

During the first portion of the depression of the handle 156, theunder-carriage is moved rearwardly as previously described. Prior tothis, the forward end of the trace is placed in the lifted positionshown in Figure 9, so that the upper can", lug 313 is within the uppertrace slot 311. Completion of the handle depression, which also movesthe hangar Bill, then causes the trace to turn the cam 260 in clockwisedirection and lower the shaft 2 This lowers all of the totalizer bars sothat their upper rack portions 255 engage the tomv zer pinions. hus uponlifting the handle these rack bars which were allowed to move rearwarciyto extents controlled by the particular stop lugs depressed by theactuated number keys rotate the corresponding totalizer wheelsdirections to effect a subtracting action. Where any of these wheelsmoves between a 9 and 9 indication, the carry-over operates as ineffecting addition, except in the reverse direction because the reversedirection rack is in operative relation to the pinions.

Clearing It is, of course, necessary to bring all the totalizer wheelsto 0" before starting an addition operation. Means are provided by wiichthis may be done by actuation of the handle bar 1:30. For purpo? knob29!) is moved forwardly to its extreme position in Figure 10. In thisposition of the parts the L.-shaped member 2'75 is in its forwardlytilted position so that the trace 27? is lowered into the same positionin which it was placed for adding, with the lower cam lug 3R. engaged inthe lower trace notch'liiZ. The lever 288 is pivotally connected througha link 3% to a plate 3-51 which is pivoted at 352 to the right partitionwall 217. As shown best in Figure 13, dotted lines, this plate 351 hasan elongated notch 353 in its upper edge presenting an inclined camsurface 354 at one end of the notch and a shoulder 355 at its oppositeend. Beyond the shoulder 355 is a cam face 357. Riding on the cam faces354 and 357 are follower rolls 358 and 35 9, respectively, on a pair ofscissor elements 360 and 361, respectively (see Figure 10). Thesescissor elements 36% and 361 each have slots in their upper ends as at362, each of which embraces a fixed pivot 363 projecting from the wall217. These scissor elements are thus permitted an up and down motion atthe slots 362, fulcruming about the centers of the cam follower rolls358 and and they also have pivotal motion about the fixed pivot 363. Thepivot pin 352, located between adjacent edges of the scissor elements360 and 361 which are notched to receive it, acts to limit the swingingmotion of each scissors element toward the other. These scissor elementsare movable in overlying planes and at their lower ends they areprovided with oppositely directed flanges 365 and 366 which project overinto a common plane and in the same plane with a lug 367 upstanding froman arm 363 pivoted at 369 to the hanger 301. This arm 3058 has a camfollower roll 370 in position to be contacted by an inclined cam face371 at the rearward end of the right hand side member 175 of theunder-carriage. This same side member has an oppositely sloped cam face372 spaced forwardly of the cam face 371. When the knob 290 is in theclear position, the plate 351 is rocked to the position shown in Figure10, the cam follower 358 then riding at the base of the elongated notch353, while the cam follower roll 359 rides on the cam face 357. In thisposition of the parts, the lower end of the scissors member 360 isimmediately above the lug 367 and prevents lifting the rear end of thearm 368 by engagement of the follower roll 373 on the cam face 371,beyond the limited motion required to bring the bottom of the scissorsslot against the pivot 363 as shown in Figure 11. It is, however, liftedsufficiently to come above the lower end of the other scissors member361. Continued rearward motion of the under-carriage, since the arm 368cannot lift, causes this arm, together with the hanger 301 to which itis attached, to move rearwardly with it and it also causes the otherscissors member 361 to swing to the dotted line position shown in Figure11. The movement of the hanger 301 rearwardly causes the trace to bemoved in the same manner that it did during adding and thus rocks thecams 260 counterclockwise and raises all the totalizer bars 250 to bringtheir lower rack bars into engagement with the totalizer gears and italso retracts the totalizer wheel locks 140, but this after only a shortrearward travel of the under carriage. The adjustment of the knob 290 toclear position also moves forwardly a slide plate 372 (Figures 3 and 29)having a notch 373 engaging a pin 3730 on the arm 283, so that a forwardedge portion 374 thereof extends above a shoulder 245 on the dog 235.This prevents the turning of this dog and holds the hooks 224? elevatedso that all the pilot bars are free to be moved rearwardly with theunder-carriage. Continued rearward travel of the carriage thereafterthus rotates all of the pinions until each is stopped by engagement ofone or the other of its totalizer wheel ears 135 with a stop 375 (seeFigures and 13). This stop 375 is pivoted at 376 to the frame member 217and is provided with a downwardly extended slotted arm 377 whichembraces a pin 378 projecting from the inner face of the plate 351 andwhich may form the pivotal connection to the link 3150. When this plate351 was initially rocked by the positioning of the knob 290 in clearposition, the stop 375 was brought down into the dotted line positionshown in Figure 13 where it is in position to be engaged by thetotalizer wheel ears 135. The under-carriage may continue its fullstroke rearwardly while the bars 250 are stopped by the positivestopping of their respective totalizer wheels in any position in whichthey may happen to be, further motion of the under-carriage merelyextending the springs 206 which act independently for each of the pilotbars. When the lower ends of the scissors elements are sufiicientlyseparated to permit the lug 367 to move upwardly between them, the sidemember is then freed for motion independently of the continued rearwardmotion of the hanger so that it can complete its rearward stroke to thepoint where the cam follower 3761 drops back of the cam face 372 of theside member 175 into the position shown in Figure 12. At the extremerearward position of the under-carriage on the return motion of thehandle 150, the totalizer bars are immediately brought out of mesh withthe totalizer pinions, since the clearing action of the wheels has thenbeen completed. The lowering of the lug 367 as the cam follower roll 370rolls down the cam faces 372 permits the scissors member 361 to returnto its former position close to the scissors member 361) and with itslower end immediately above the lug 367. Thereafter as theunder-carriage is pulled forwardy by lifting the handle 150, since thelug 367 is now prevented from lifting beyond the lost motion permittedat the pivot 363, the hanger 301 is immediately connected for retractionwith the under-carriage which presses forwardly on the trace 270 androcks the cams 269 in clockwise direction, returning them to theoriginal position. Thus the return motion of the totalizer bars is outof operative contact with the totalizer pinions'.

Means are provided for releasably locking the handle 290 in either itsclear or subtract positions. As shown on Figures 3 and 10, this meanscomprises a pair of arms 380 and 381 connected to the cam pivot shaft 278. The arm 38!) extends back of the arm 281i and is provided with a pairof spaced shoulders 382 and 383,

etween which is a concave face 384. A lug 335 on the arm 236 is adaptedto be engaged with either of the shoulders 383 or 382, or with the face384. When the arm 230 is in its forward position at clear as shown inFigure 10, the lug 385 is in engagement with the shoulder 383. The arm381 has pivoted thereto adjacent to its rearward end, a dog 3% having acurved cam face 391 which may be engaged by a bevel face 392 on thehanger 301 when the hanger is moved theretoward as in Figure 12. In thisposition of the parts, a lug 393 on the dog engages a stop 394 on thearm 381, and the dog 390 is ordinarily held in this angular position asby a leaf spring 3%. Since the dog cannot rock clockwise from theposition shown in Figure 12, when the inclined face 392 of the hangerstrikes it, the arm 381 is rocked upwardly, rocking the arm 380 andlifting it from engagement with the lug 385. This releases the arm 280from clear position and the spring 3510, working through the plate 351and the link 35%, returns the arm 280 to its normal add position. Whenthe arm 280 is in subtract position, the shoulder 3S2 engages the lug385 and here, again, as the hanger is retracted, the arm 380 is lifted,releasing the lock. When the hanger 301 is moved in the reversedirection, as from the position shown in Figure 11 to that shown inFigure 12, the dog 390 may yield and permit it to pass without liftingthe locking arm 388. This locking arm can be released at any time,however, by the operator, by merely depressing a pin 397 which extendsthrough the casing, and the lower end of which bears on a rearwardextension 398 of the arm 331.

When the arm 28'!) is in its intermediate add position or insubstracting position, the plate 351 is in such angular relation thatthe scissors members have their cam followers 358 and 359 riding ontheir high points of the plate 351 which holds their lower endsseparated in the positions shown in Figure 3 so that they offer noobstruction to the lifting of the lug 367, so that the hanger is notcoupled to move with the under-carriage 15 until toward the end of theunder-carriage backward stroke when it is picked up by the rod 176, aspreviously explained,

The selective stop carriage return mechanism As before noted, at the endof a number-selecting operation, at which time the selector stopcarriage 40 has been moved at least part Way toward the left side of themachine, the upward motion of the handle 15'!) normally returns thecarriage to its starting position at the extreme right hand end of itstravel. Such action occurs at the end of the normal adding orsubtracting operations, but certain variations of this are possible. Thereturn mechanism comprises a stop lever 400 (Figures 23 and 24) which ispivoted at 401 to the arm 58 between its ends and overlies the forwardextension of the under-carriage member 179. This stop lever 400 isprovided with a forwardly extending actuating and controlling arm 402 oneither side of which may be engaged downwardly extending forks 463 or" acontrolling slide 404. This slide is i movable along a guide post 405and may be yieldingly latched in any one of three axial positions as bya spring pressed ball latch 4% which engages in any selected of threeperipheral grooves 407, 408 and 409 of the post 465. An actuating piece410 which extends through a slot 4-11 in the forward wall of the casingengages with the slide 464 and may be employed to move the slide to anyselected of its three axial positions. The forward end of the lever 400has an end shoulder 412 which extends well forwardly, a second shoulder413 at a much shorter distance from the fulcrum 491 and between them ispositioned a slot 414. When the stop lever is in its mid-position shownin Figure 23, the flange 190 of the under-carriage as it is movedbackwardly finally contacts with the shoulder 413 and rocks the righthand end of the lever 58 rearwardly to an amount sufiicient to permit alatch 42th pivotally carried by the guide pin 62 to be swung outwardlyunder the action of a torsion spring 421 from the position shown inFigure 23 to that shown in Figure 24 in which the end portion 421 of thelatch engages 2. lug 422 on the sliding plate 55. On subsequent liftingof the operating handle 150, which retracts the under-carriage, the camroll 195 on the under-carriage engaging the lever 58, pushes the slide55 forwardly, turning the segment 51 clockwise and winding the ribbon 50thereon, thus to return the carriage to its starting position shown inFigure 23. Just as it reaches this position, a fixed abutment 425 isengaged by a lug 426 projecting from the latch 420 so that the latch isrocked out of engagement with the lug 422, thus releasing the carriagefor lateral motion toward the left when this is caused by depression ofone more of the number keys. Should the operator discover that he hasmade an error in depressing any of the number keys, he may wish toreturn the selector stops to neutral raised positions without impartingany motion to the totalizer wheels. When this is desired, the actuator410 is moved to its left hand or error position, bringing the shoulder412. in line with the lug 191 of the under-carriage. On them actuatingthe handle bar 1551 to a small extent, the lever starts its forwardrocking motion very early and the lever 58 reaches its limitcorresponding to Figure 24 before the handle has been moved sufficientlyto displace the totalizer actuator bars. The operator then returns thehandle bar 150 to its upright position, whereupon the return of theunder-carriage to its starting position returns the stop selectorcarriage to its starting position and all of the selector stops whichare then depressed are lifted by the lifter plate 47.

in some cases it may be desired to repeat the same sequence of digitsfor successive totalizing operations. In such a case it will not bedesired to return the carriage between successive totalizer actions, butto produce these totalizer actions without disturbing the previoussetting of the selector stops or the carriage position. When this isdesired, the control member 410 is moved to its right hand or repeaposition, in which the lever 400 is swung to the right to the extremedotted line position shown in Figure 24. In this position, backwardmotion of the under-carriage by depression of the handle 15h causes thelever lug 1% to ride into the slot 414 of the lever 400. This causes themotion of the handle 15b to fail to move this lever 400 so that thelever 58 is not moved to the position of Figure 24. Thus when theoperating handle 15% is actuated, the carriage remains in its formerposition and repeated actuations of the hand lever will cause repeatedadditions or subtractions of the same number for which the selectivestops have been set, depending on whether adding or subtracting is beingdone, determined by the setting of the control knob 291).

Means are provided by which a complete stroke of the operating handle150 is insured for each adding, subtracting, or clearing operation, ashort stroke being permitted only where an error has been committed andit is desired to erase a number introduced into the machine through theselector stops and before an addition or subtraction has been made. Thismeans is illustrated in Figure 6. The lower end of the arm may beprovided with a pivoted dog 430 normally held in the angular positionshown in full lines in Figure 6 as by a spring 431. This dog is adaptedto be moved over the upper edge of a plate 432 which is provided with aplurality of serrations 433 at its intermediate portion and withunserrated arcuate end portions 434 and 435. The arm 17% may be swungfrom its forward position shown, rearwardly until the dog 43% approachesthe first apex 436 of the serrations and returned freely. The extent ofthis permissible motion is sufficient to provide for return of the stopselector carriage erasing error in the depression of the number keys,but is insufiicient to cause any motion of the totalizer bars whichefiects movement of the totalizer wheels. However, after the arm 170 hasbeen swung beyond the first apex 4-36, the dog 430 will be swung intoposition to obstruct return motion of the arm 171), as shown in thecentral dotted position of Figure 6, so that the return motion cannot beinitiated until the arm 171 has been moved beyond the last apex 437 ofthe serrated portion, whereupon the arm 170 is free to be returned toits initial position, the dog 430 swinging in the reverse directionsufficiently to clear the apices of the serrated portion.

Operation From the foregoing description of the machine, it will beunderstood that with the control knob 29% set at the add position, theoperator may depress the number keys in the order of the digits of thenumber to be added which will cause the selector carriage stops to beset accordingly, and the selector carriage to be moved to the left to anextent depending upon the number of keys depressed. The swinging down ofthe handle bar 156 by the operator, followed by a rise of this handle,will then cause the totalizer wheels to be rotated each by the amount ofthe number key depressed for that denominational order, and at eachreturn of the handle 150 the selector stop carriage will he returned toits initial position ready for the next row of figures to be added tothe first. This next row is then introduced into the machine by pressingthe number keys in the order that these digits appear from left toright, and this number is then added to the preceding by a downward andthen upward motion of the handle 150, whereupon the machine is then incondition to receive another set of digits of another number to beadded. This action takes place until the desired amount of addition hasbeen accomplished, the total then appearing on the totalizer wheelsvisible through the sight opening.

After addition has been completed, the machine may be cleared byadjusting the knob 290 to its foremost position and then depressing andraising the handle bar 17 150. This will return all the totalizer wheelsto indication.

When it is desired to subtract, the minuend number is introduced intothe totalizer wheels by an adding operation, the digits of the numberbeing introduced by depressing the corresponding number keys and thenmanipulating the handle 150. The control knob 290 is then moved tosubtract in its rearward position, and the subtrahend is then introducedinto the machine by depressing the number keys in the order of thedigits of this number. The handle 150 is then given a downward strokeand released, whereupon the totalizer wheels will indicate theremainder. The machine may then be cleared in the same manner as before.

The machine may be made so small and compact that it is convenient forthe operator to adjust the knob 290 and to depress the number keys withthe fingers of either hand and then to depress the actuator bar 156 bydownward and forward pressure of the heel of the same hand, the springs325 and 164 returning the actuator bar 150 to starting position as soonas pressure from the operators hand is released. Thus the use of onlyone hand is necessary to operate the machine, the other hand being freefor other use.

From the foregoing description of an embodiment of this invention itwill be evident to those skilled in the art that various changes andmodifications may be made without departing from its spirit or scope.

I claim:

1. A machine of the class described comprising a bank of coaxiallyarranged totalizer wheels, a gear for each of said wheels, operativelyconnected thereto, an actuator for each gear having opposed rackportions on opposite sides of its respective gear, spaced by a distancegreater than the maximum diameter of said gear, operator-com trolledmeans for moving said actuators lengthwise of said rack portions bypredetermined amounts, means for moving said actuator selectively tobring either of said rack portions of each actuator into mesh with itsrespective gear or with both rack portions out of such mesh preparatoryto such lengthwise motion in one direction, said means for moving saidactuator comprising a shaft operatively associated with said actuatorsand mounted for movement transverse to the length of said racks, anoscillatory cam carried by said shaft and positioned between fixedabutments to raise said shaft and said actuators upon being swung in onedirection and to lower them upon being swung in the other direction,means movable by said operator-controlled means for swinging the saidcam, said cam swinging means being constructed and arranged to be moved,selectively, into engagement with opposed portions of said cam to swingit in one direction or the other, as desired, and means engaging saidcam swinging means and having an extension manipulatable by the operatorto move said cam swinging means selectively into engagement with eitherof the opposed portions of said cam.

2. In a machine of the class described having a totalizer supported forrotation about a fixed axis, differential actuators comprising opposedracks, one or the other of which racks is shifted into operatingengagement with the totalizer to effect adding, subtracting or clearing,and a manually operable actuator driving member; the combination of ashaft operatively associated with said actuators and mounted formovement transverse to the length of said racks, an oscillatory camcarried by said shaft and positioned between fixed abutments to shiftsaid shaft and one or the other of said opposed racks into engagementwith said totalizer when said cam is swung in one or the otherdirection, a cam swinging means settable to engage opposed portions ofsaid cam, respectively, and movable to swing it in one or the otherdirection, manually operable selector means positioned to engage saidcam swinging means for selectively setting said cam swinging means inengagement with one or the other of said opposed portions of said cam,and means drivingly connecting said cam swinging means and said actuatordriving member, selectively, toward the beginning or the end of thedriving stroke of said member.

3. In a machine of the class described having a totalizer supported forrotation about a fixed axis, difierential actuators comprising opposedracks, one or the other of which racks is shifted into operatingengagement with the totalizer to effect adding, substracting orclearing, and a manually operable actuator driving member, thecombination of a shaft operatively associated with said actuators andmounted for movement transverse to the length of said racks, anoscillatory cam carried by said shaft and positioned between fixedabutments to shift said shaft and one or the other of said opposed racksinto engagement with said totalizer when said cam is swung in one or theother direction, a cam swinging means settable to engage opposedportions of said cam, respectively, and movable to swing it in one orthe other direction, manually operable selector means positioned toengage said cam swinging means for selectively setting said cam swingingmeans in engagement with one or the other of said opposed portions ofsaid cam, a driven member engageable with said cam swinging means andpositioned to be engaged by said driving member toward the end of itsdriving stroke, and control means operatively associated with saidselector means and positionable to drivingly connect said driven memberand said driving member towards the beginning of the driving stroke ofsaid driving member.

4. In a machine of the class described having a totalizer supported forrotation about a fixed axis, differential actuators comprising opposedracks, one or the other of which racks is shifted into operatingengagement with the totalizer to effect adding, subtracting or clearing,and a manually operable actuator driving member; the combination of ashaft operatively associated with said actuators and mounted formovement transverse to the length of said racks, an oscillatory camcarried by said shaft and positioned between fixed abutments to shiftsaid shaft and one or the other of said opposed racks into engagementwith said totalizer when said cam is swung in one or the otherdirection, a cam swinging means settable to engage opposed portions ofsaid cam, respectively, and movable to swing it in one or the otherdirection, manually operable selector means positioned to engage saidcam swinging means for selectively setting said cam swinging means inengagement with one or the other of said opposed portions of said cam,said selector in a first setting conditioning the machine for an addingoperation, a driven member engageable with said cam swinging means andpositioned to be engaged by said driving member toward the end of itsdriving stroke, and control means operatively associated with saidselector means and positionable when said selector means is in its saidfirst setting to drivingly connect said driven member and said drivingmember towards the beginning of the driving stroke of said driv ingmember.

5. In a machine of the class described having a totalizer supported forrotation about a fixed axis, differential actuators comprising opposedracks, one or the other of which racks is shiftable into operatingengagement with the totaiizer to effect adding, subtracting, orclearing, and a manually operable differential actuators driving member;the combination of an oscillatory cam operatively connected with saiddifferential actuators to shift one or the other of said opposed racksinto engagement with said totalizer when said cam is swung in one or theother direction, a cam swinging means settable to engage opposedportions of said cam, respectively, and movable to swing it in one orthe other direction, manually operable selector means engaging said camswinging means, and settable in first and second positions,respectively, for selectively setting said cam swinging means inengagement with one of said opposed portions of said cam to conditionthe machine for addition and in engagement with the other of saidopposed portions to condition the machine for subtraction, a firstdriven member connected with said cam swinging means and positioned tobe engaged by said driving member toward the end of its driving stroke,clearing control means in cluding a second driven member pivotedlysupported on said first driven member, said second driven member beingpositioned to engage and normally pivot free of said driving membertowards the beginning of its driving stroke, means operative by saidselector in its first position to prevent said second driven member frompivoting free of said driving member, whereby both said driven membersare driven by said driving member towards the beginning of its drivingstroke.

6. In a machine of the class described having a totalizer supported forrotation about a fixed axis, differential actuators comprising opposedracks, one or the other of which racks is shiftable into operatingengagement with the totalizer to effect adding, subtracting, orclearing, and a manually operable differential actuators driving member,the combination of an oscillatory cam associated with said differentialactuators to shift one or the other of said opposed racks intoengagement with said totalizer when said cam is swung in one or theother direction, two engageable means supported, respectively, atopposed portions on the body of said cam, a cam swinging means settableto engage one or the other of said engageable means, respectively, andmovable to swing said cam in. one or the other direction, manuallyoperable selector means connected to said cam swinging means andsettable in first and second positions, respectively, for selectivelysetting said cam swinging means in engagement with one of saidengageable means to condition the machine for addition and in engagementwith the other of said engageable means to condition the machine forsubtraction, a first driven member connected with said cam swingingmeans and positioned to be engaged by said driving member toward the endof its driving stroke, clearing control means including a second drivenmember pivotedly supported on said first driven member, said seconddriven, member being positioned to engage and normally pivot free ofsaid driving member towards the beginning of its driving stroke, atiltable plate having a camming surface formed thereon, a pivotedlysupported arm having a camfollower positioned thereon to ride on saidcamming surface, said camming surface being formed to move said arm inposition to prevent said second driven member from pivoting free of saiddriving member when said plateis tilted, whereby both said drivenmembers are driven by said driving member towards the beginning of itsdriving stroke.

7. In a machine of the class described having a totalizer supported forrotation about a fixed axis, differential actuators. comprising opposedracks, one or the other of which racks is shiftable into operatingengagement with the totalizer to effect adding, subtracting, orclearing, and a manually operable differential actuators driving member;the combination of an oscillatory cam associated with said differentialactuators to shift one or the other of said opposed racks intoengagement with said totalizer when saidrcam is swung in one or theother direction, two en gageable means supported, respectively, atopposed portions on the body of said cam, a cam swinging means settableto engage one or the other of said engageable means,

respectively, and movable to swing said cam in one or the otherdirection, manually operable selector means connected to said camswinging means and settable in first and second positions, respectively,for selectively setting said cam swinging means in engagement with oneof said engageable means to condition the machine for addition and inengagement with the other of said engageable means to condition themachine for subtraction, a first driven member connected with said camswinging means and positioned to be engaged by said driving membertoward the end of its driving stroke, clearing control means including asecond driven member pivotedly supported on said first driven member,said driving member having first and second spaced apart cammingsurfaces, said second driven member being positioned to engage saidfirst spaced camming surface towards the beginning of the driving strokeof said driving means and said second spaced camming surface on thereturn stroke thereof, said second driven member normally pivotingfreely to ride over said spaced camming surfaces, a tiltable cammingplate having a camming surface formed thereon, two pivotedly supportedarms, each arm having a cam follower positioned thereon to ride on saidcamming surface, said camming surface being formed to move, when saidplate is tilted, one said arm in position to prevent said second drivenmember from pivoting free of said first spaced camming surface, wherebysaid driven members are driven by said driving member towards thebeginning of its driving stroke, and to move the second said arm inposition to prevent said second driven member from pivoting free of saidsecond spaced camming surface on said drivingmember on the return strokethereof, whereby said driven members are returned to their initialpositions.

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